diff --git a/include/json/config.h b/include/json/config.h
index ad55a4d..7f9ac69 100644
--- a/include/json/config.h
+++ b/include/json/config.h
@@ -80,8 +80,8 @@ extern JSON_API int msvc_pre1900_c99_snprintf(char* outBuf, size_t size,
 // These Macros are maintained for backwards compatibility of external tools.
 #if (defined(_MSC_VER) && _MSC_VER >= 1900) ||                                 \
     (defined(__GNUC__) && __cplusplus >= 201103L) ||                           \
+    (defined(__clang__) && __clang_major__ == 3 && __clang_minor__ >= 3)
 
-    (defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 3)))
 #define JSONCPP_CXX_STD_11 1
 #else
 #define JSONCPP_CXX_STD_11 0
diff --git a/src/lib_json/json_value.cpp b/src/lib_json/json_value.cpp
index 2219b9c..2938ea5 100644
--- a/src/lib_json/json_value.cpp
+++ b/src/lib_json/json_value.cpp
@@ -16,7 +16,6 @@
 #include <iostream>
 #include <sstream>
 #include <utility>
-#include <math.h>
 
 // Provide implementation equivalent of std::snprintf for older _MSC compilers
 #if defined(_MSC_VER) && _MSC_VER < 1900